/*
 * Copyright (C) 2008-2009 the original author or authors
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *         http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.code.liquidform.internal.managedobjects;

/**
 * The application of an aggregate function (such as <tt>avg()</tt>).
 */
public class SimpleAggregateExpression extends FrameworkManagedObject {

	public enum Function {
		AVG("avg"), MIN("min"), MAX("max"), SUM("sum"), COUNT("count");
		final String stringForm;

		private Function(String stringForm) {
			this.stringForm = stringForm;
		}
	}

	private final Function function;

	private final FrameworkManagedObject argument;

	public SimpleAggregateExpression(Function f, FrameworkManagedObject arg) {
		this.function = f;
		this.argument = arg;
	}

	@Override
	public String getTargetRepresentation() {

		return function.stringForm + "("
				+ argument.getPreferredStringRepresentation() + ")";
	}

}
